Best Split Bushing for Conduit: Top Insulated Grounding Bushings
The right split grounding bushing protects conductors during conduit pulls, reduces wear on insulation, and simplifies post-pull adjustments. This guide highlights five reliable options that combine durable die-cast zinc construction with adjustable lay-in lugs for copper or aluminum conductors. Each product supports rigid IMC or EMT conduit and is designed for easy installation in demanding electrical environments across the United States.
Summary of chosen products
| Product | Conduit Compatibility | Conductor Range | Construction |
|---|---|---|---|
| COREX 2″ Insulated Split Grounding Bushing | Rigid/IMC or EMT | Copper or Aluminum | |
| COREX 5″ Insulated Split Grounding Bushing | Rigid/IMC or EMT | Copper or Aluminum | |
| COREX 1″ Insulated Split Grounding Bushing | Rigid/IMC or EMT | Copper or Aluminum | |
| Bridgeport Mighty-Rite SGB-383CL | 1″ Trade | Various conductors | |
| Bridgeport Mighty-Rite SGB-385CL | 4-1/0 AWG AC Cable, 1-1/2″ Trade | Large conductors |
COREX 2″ Insulated Split Grounding Bushing
This 2″ split grounding bushing from COREX combines zinc die-cast durability with an aluminum lay-in lug for straightforward adjustments. It is designed for both copper and aluminum conductors and offers a thermoplastic insulated bushing rated up to 150°C, making it suitable for a range of conduit installations. Its compact size supports tight spaces while maintaining strong grounding and conductor protection during pulls.
COREX 5″ Insulated Split Grounding Bushing
The larger 5″ model follows COREX’s design language with a die-cast zinc body and an adjustable aluminum lay-in lug. It accommodates copper or aluminum conductors with a robust thermoplastic insulation and is rated for high-temperature environments up to 150°C. This size is well-suited for mid-to-large gauge conductor pulls in commercial or industrial conduit runs, offering dependable grounding during installations and post-pull adjustments.
COREX 1″ Insulated Split Grounding Bushing
The 1″ COREX bushing provides the same core benefits in a compact footprint: zinc die-cast construction, an aluminum lay-in lug for easy adjustments, and a thermoplastic insulated bushing rated to 150°C. It supports both copper and aluminum conductors in tight confines where a smaller bushing is essential for efficient conduit management and reliable grounding during pulls.
Bridgeport Mighty-Rite SGB-383CL
The SGB-383CL is a patented insulated split grounding bushing by Bridgeport, designed for 1″ trade. It emphasizes ease of wire installation with an adjustable grounding lug and practical post-pull flexibility. The die-cast zinc body provides durability, and the model supports versatile conductor configurations, making it a reliable option for installations where space and alignment are critical.
Bridgeport Mighty-Rite SGB-385CL
The SGB-385CL extends Bridgeport’s Mighty-Rite line to larger conductors, featuring a hinged design for easier alignment and installation after a pull. The 4-1/0 AWG AC cable compatibility supports heavy-duty applications, and the zinc alloy construction complements the robust grounding lug, making it a practical choice for industrial conduit systems that demand post-pull flexibility and durable performance.
Bridgeport Mighty-Rite SGB-387CL
The 2-1/2 inch Mighty-Rite SGB-387CL builds on Bridgeport’s established design, suitable for larger conduit runs and heavier conductor sets. It maintains the die-cast zinc construction and an adjustable grounding lug, designed to simplify wire management during installations and after cable pulls. This makes it a reliable option for industrial electrical projects requiring robust grounding while accommodating post-pull adjustments.
Bridgeport SGB-384CL
The SGB-384CL is a 1-1/4 inch Mighty-Rite insulated grounding split bushing with a zinc die-cast body. It is designed to provide reliable grounding and post-pull adjustment options in tighter conduit runs where space is at a premium. The compact form factor makes it well-suited for smaller installations without sacrificing grounding performance or ease of use.
Buying Guide: Key Considerations For Split Grounding Bushings
- Conductor compatibility: Confirm whether the bushing supports copper, aluminum, or both. Dual-rated options offer flexibility for mixed wiring environments.
- Conduit compatibility: Ensure the product accommodates your conduit type (IMC, EMT, or rigid) and the intended trade size or diameter.
- Material and durability: Die-cast zinc is common for high strength and longevity, while some models use zinc alloy for larger configurations. Consider environmental exposure and rating needs (e.g., high temperatures up to 150°C).
- Adjustable lay-in lug: A modular or adjustable lug simplifies post-pull wiring and makes it easier to install or modify conductors without reworking fittings.
- Size and space: Larger bushings handle bigger conductors but require more installation space. Smaller bushings fit tight spaces but may limit conductor size.
- Installation practicality: Look for hinged or easy-align designs for quicker fitter setup, especially in crowded or hard-to-reach installations.
- Post-pull flexibility: Some models are expressly designed to facilitate installation after wire pulls, reducing rework and downtime.
When selecting a split grounding bushing, compare the balance of size, conductor range, and mounting practicality against project demands. For projects prioritizing post-pull flexibility, prioritize hinged or adjustable lug designs. For industrial applications with heavy conductors, opt for larger, rugged die-cast or zinc alloy models with high-temperature insulation ratings.